Motor-driven surface-treating machine



A. A. CLARKE.

MOTOR DRIVEN SURFACE TREATING MACHINE.

APPLICATION FILED FEB. i3, 920. I*

' Patented Sept. 3, 1921.y

2 SHEETS-SHET l.

NVE/vm? /7/7. a r@ A Trae/wry A. A. CLARKE.

MOTOR DRIVEN SURFACE TREATING MACHINE.

- APPLICATION FILED FEB. 13.1920. 1,390,501

Patented Sept. 13, 1921.

2 SHEETS-SHEET `ALEX. A. CLARKE, OF DALLAS, TEXAS.

Specification of Letters Patent. Patented Sept, 13, 1921.

Application filed February 13, 1920. Serial No. 358,485.'

T0 a-ZZ whom it may concern: Y

Be it known that l, ALEX A.. CLARKE, a citizen ot the United States7 residing at Dallas7 in the county ot' Dallas and State ot Texas, have invented certain new and usetul -Improvements in Motor-Driven Surfaceand practical arrangement ot the various parts whereby simplicity and efficiency is had; also to do with the co-action ot the various parts which make :tor a more compact and satisfactory machine.

In carrying out the invention an electric motor is mounted in a traine and arranged within a cooling chamber in which a suitable agitator for causing a circulation ot air is also provided. A surface treating drum is carried by the same trame and is driven by the motor. An electric controlling means is also provided on the :trame tor controlling the operation ot the motor. The trame is adj-ustably mounted on a suitable base and means is carried by the frame Jtor adjusting it on the base whereby the surtace treating l drum is advanced toward and retracted from the work. Means is also provided for 'etfecting a locking of the adjusting means when the drum has been broughtV to a desired position. Other novel and specilic features will be hereinafter more fully pointed out. n l The invention will be more readilyunderstood trom a reading of the following speci-y [icatiou and by reterencete the accompanying drawings, in which an example ot the invention is shown7 and wherein:

Figure 1 is a side elevation ot amachine constructed in accordance with this invention,

Fig. 2 is a plan view of the same,

Fig. 3 is a central vertical sectional view ot the machine,v Y'

Fig. lefis a partial longitudinalvertical sectional view, Y

Fig. 5 is asectional detail of one ot ,the :vertical adjusting. Aposts and component parts, f

Fig. 6 is a sectional detail ofthe drum and sleeve fastening means, andl l Fig. 7 isa detail ot theadjustme'nt locking means.

In the drawings the numeral 10 designates an upright rectangular trame having outwardly directed brackets 11 at its top and bottom at each side. At the center ot the bottom ot each end ot the trame a collar 12 is fastened and receives the ends ot fixed shaft 13 on which a ball bearing cone 141 ismounted to receive near each end7 ball bearings 15 conlined in ball races 16. The ball races-16I are secured to the inside ot end plates 17 forming parts of a drum 18. The drum 18 is surrounded by a sheet 19 ot sand paper or other suitable material tor abrading work. As is shown in detail in Fig. 6 the sand-paper 19 has its ends fastened in a depression 20 yin the surface of the drum by meansota bar 21'and screws 22, which bar in practice has its outer surface inward from the surface of the sleeve rformed by the sand paper so as not to engage the surface worked upon.

ithin the upper portion ot the trame a motor chamber 23 is formed and this chamber is preferably circular in cross-section with its top wall 2st projecting upward from the tra-me. The fields 25 of amotor are.

mounted in this chamber which extends transversely of the trame the same as the drum.' At one end ot the chamber a mountingv plate 26 is inserted and properly tastened. rlhis )late has apertures 27. Anarmature 28 is mount-ed withinthe field 25 and has a shaft 29 which engages in a ball bearingBO in the plate 25 and at its opposite end in a ball bearing member 31 whichis carried by a mounting plate 32 having apertures A. fan 34 is mounted on the armature '28, and is revolved thereby. This `fan sets up a cir-` culation ot air through the apertures 2T and 33 `the'Jrf-eby cooling the motor which is a very important and essential feature.' .K A spur gear is mounted on the armature shaft and meshes with a pinion 36 mounted on a bracket 37 and projecting through the bottom wall ot the chamber 28. Thispinion 36 meshes with and drivesy a gear 38 fastened to the drum 18. It will lbe dseen thatthe drum is driven bymeans or' a gearing direct tromthe 'motor shaft. lt will also be Vnoticedl that the ends ot the drum are .reduced in diameter so as not Ato mar the work. lt .is pointed out that vthe whole arrangement is compact and simple.

T he trame is mounted upon vertical posts 88 with.' their lower endsftastened to va base 39. r s shown in detail in 5 the upper portion each post is screw-threaded and receives afsprocket Q which iS. threaded thereon. Each sprocket l0 beais on the top ot' the trame and is contined by an arm ll extending from the top wall 24C. An endless sprocket chain 42 passes over all ot' the sprocket wheels el() and is tightened by means of a belt tight-ener 3 mounted on one of the bi'ackets ll on top o't the trame. Y Between the brackets at one side ot the trame a tubular handle sie is mounted while in the other two brackets a tubular handle l5 is mounted. rl`he lower end of the handle 1l-l is confined within a liang'e member lo secured to the lower bracket 111; while the upper end 'is confined in a similar flange member el? so that the handle may be rotated. A plug' 48 as is best shown in Fig. -it is secured in the upper end ot the 'tubular handle and projects upward through the top bracket ll and has lixed thereon a sprocket wheel el?) over which the chain ft2 also passes. It will be seen that by rotating' the handle le the chain Ll2 is moved in either direction and the sprocket wheel 40 sinmltaneously rotated, wherebythe trame l0 .is adjusted verticallyv on the posts. For locking the parts in adjustedposition an idle sprocket 5() is loosely mounted on a post 5l so as to mesh with the sprocket 49. A thumb nut is threaded on the post and when tightened tastens the sprocket 5() against rotation thus also locking' the sprocket 49 against rotation.

ll'vithin the handle 45 which is not rotatable. a suitable electric switch 53 is mounted and provided with a plunger 5J: projecting; through the wall of vthe handle. An electric cable leads into and through the handle to the switch 53 while a second cable 5G leads 'trom the switch to the motorand is suitably connected thereto, the details ot' construction ot the motor not being` illustrated or described. ltfwill be seen that the oilierator may turn the handle dit with one hand and adjust the machine and may oi'ierate the switch with the other hand` so that the machine is at all times .entirely under his control.

The base S) constitutes an elongated plate member having' an opening 5T at its ceiitral portion through which the drum projectsV to engage the work. rl'he base also has shoes or runners :38 ot cloth or any suitable material stretched over its bottom surface on each side ot the drinn and suitably fastened. The particular construction of the same bein; covered by a separate application tiled Januariv l. 1920. Serial No. 351.156. .lt to .be understood that the posts 38 could be moiuited on anyV suitable kind of abase.

.ln using` the machine the operator grasps the handles 4faand 45 and depresses the plunger 5lso as to start the motor.. By rotating the handle t, the chain 4:2 is caused to trai-'el thereby turning the sprocki-its 40' which ride up or down on the posts 38 according` to the direction in which the handle it is rotated. rlhe traine being attached or supported on the sprockets al() is adjusted vertically whereby the drum 1S is moved toward or trom the work through the slot 5T in the base 39. [t will be seen that ay very minute adjustment may be had and the drinn ma y be adjusted while the machine is in operation. Thesand paper 1S) may be easily replaced when necessary.

what l claim, is:

l. ln a machine ot the character described. the combination with a base, of substantially vertical posts secured to the base and haring their upper portions screwthreaded, a. traine carrying*apertured knuckles slidably mounted upon the post, said trame havin apertured arms receiif'ing' the posts and spaced from. the knuckles, sprocket wheels engaging the screwthreaded portion ot the post and arranged between the knuckles and arms to be held thereby against vertical displacement` pairs ot horizontally extending` arms carried by the Ylrame near its ends and extending outwardly.I a pair oli `vertical handles arranged between and connected with Vthe horizontallyv extending arms` one handle being` rotatable. a sprocket wheel connected with the upper end ot the rotatable handle to be turned thereby, a sprocket chain engaging all o'li the sprocket wheels to cause them to be moved simultaneously, an idle sprocket wheel rotatably mounted upon. the horizontally extending arm near the sprocket wheel vcarried by the rotatable handle and perinanently engaging such sprocket wheel, and means to lock the idlesprocket wheel against turning movement.

In a machine ot' the character described. the combination with 2guide means, of a plurality ot vertical posts secured thereon, and having. their upper 'portions screwt-hreaded,a traine vertically adjustably mounted upon the posts, sprocket wheels engaging the frame and mounted upon the scrcwtlireaded portions ot the posts, outwardlyv extending horizontal arms carrii-id by the ends of the trame. vertical tubular handles arranged between the arms, one handle being' rotatable. rings pivotally receiving the ends ot the' rotzitahle handle i and secured to the arms. a sprocket wheel arranged upon one arm and having .a depending` shank extending into the upper end ot the rotatable tubular handle and attached to the same. a sprocket` chain cn- ,eaging' all ot' the sprocket wheels, a motor carried by the traine, and rotatable surtace treat-ing` element carried by the trame and driven by the mot-or.

ln testimony whereot l ailiix my signature.

CLARKE. 

